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Method and apparatus for nondestructive evaluation and monitoring of materials and structures

a non-destructive evaluation and monitoring technology, applied in the direction of mechanical roughness/irregularity measurement, instruments, specific gravity measurement, etc., can solve the problems of high cost of impact devices used in impact testing technology, need coupling to signal conditioners, and high cost of hammers and conditioners used for non-destructive evaluation, etc., to achieve the effect of higher tunability

Active Publication Date: 2012-12-11
CALIFORNIA INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention offers a new method and system for non-destructive evaluation and structural health monitoring of materials using highly nonlinear waves. These waves offer higher tunability, repeatability, and a simpler and more scalable design compared to conventional methods. The system includes a highly nonlinear actuator and a nonlinear receiver that work together to detect pulses generated by the actuator after it has propagated through the material being inspected. The technical effects of this invention include larger tunability range of the frequency, amplitude, and velocity of induced pulses, improved repeatability of measurements, simpler and more scalable design of the instruments, reduced power requirement, reduced cost of assembly and manufacturing, and reduced risk of operator error.

Problems solved by technology

The impact devices (i.e., strikers) used in impact-testing technology typically cost several hundreds of dollars or more and need coupling to a signal conditioner.
Hammers and conditioners used for non-destructive evaluation may be very expensive.

Method used

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  • Method and apparatus for nondestructive evaluation and monitoring of materials and structures
  • Method and apparatus for nondestructive evaluation and monitoring of materials and structures
  • Method and apparatus for nondestructive evaluation and monitoring of materials and structures

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Embodiment Construction

[0034]Embodiments of the present invention provide for nondestructive evaluation and monitoring of materials and structures through the use of highly nonlinear pulses and waves generated in one dimensional chains of granular components. In this disclosure, the granular components or grains may comprise granular matter, which is defined as an aggregate of particles or layers in elastic contact with each other, preferably in linear or network shaped arrangements. While embodiments of the present invention use highly nonlinear pulses and waves, additional advantages may be provided when highly nonlinear solitary waves or pulses are used, generated, and / or detected. For purposes of this disclosure, highly nonlinear solitary waves are to be considered as a specific case of highly nonlinear waves. Additionally, highly nonlinear solitary pulses are to be considered as a specific case of highly nonlinear pulses. Hence, any references to highly nonlinear waves herein are to be considered as ...

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Abstract

A method and apparatus for nondestructive evaluation (NDE) of structures and materials using a highly nonlinear medium for the generation and detection of one or multiple highly nonlinear pulses (or highly nonlinear waves) impinging on a material or structure. The apparatus includes pulse exciters that induce the propagation of highly nonlinear, weakly nonlinear or linear stress waves in the material, system, or structure to be inspected and / or detectors for the observation and the detection of the output waves from the material / structure being tested. The NDE method includes the use of the tunable highly nonlinear apparatus as impulse exciter alone, or in combination with an accelerometer or a nonlinear sensor to detect the outgoing pulse.

Description

CROSS-REFERENCE TO RELATED APPLICATIONSSTATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0001]This invention was made with government support under Grant No. CMMI0825345 awarded by the National Science Foundation. The government has certain rights in the invention.BACKGROUND[0002]1. Field[0003]This disclosure relates to a method and apparatus for the excitation and transmission of highly nonlinear pulses with selectable pulse properties into a structure or material and the detection of such pulses from the structure or material. More particularly, the present disclosure describes a method and apparatus for exciting a selectable number of controllable highly nonlinear pulses with desired shapes, amplitudes, frequencies and / or durations, which may then be used for nondestructive evaluations and / or structural health monitoring.[0004]2. Description of Related Art[0005]Non-destructive evaluation of a material or structure may be accomplished through the use of impact testin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01N29/06G01N29/24
CPCG01N29/2437G01N29/341G01N29/343G01N29/2431G01N29/045
Inventor DARAIO, CHIARARIZZO, PIERVINCENZO
Owner CALIFORNIA INST OF TECH
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